But why become a sensei though?

I haven't read it yet, but based on the cover, the heroine is Kushina and it's probably a way to achieve an initial non-forced interaction that perhaps triggers feelings.

Bro is a translation from Chinese

does this include harem?

link?

3 villages, Suna didn't participate and Konoha sabotaging Uzu is fanon and not proven to be actually true.

the village coalition destroying uzu is just a speculation, yours is straight from fanon.

No, it isn't. Konoha sabotaging them is fanon, and Suna didn't participate, but Iwa, Kumo, and Kiri did band together to ambush/overrun them.

where exactly did you get that coalition of Iwa,Kumo & Kiri bring destruction to Uzu in canon do provide a link. if using the map of Naruto then Yugakure, Takigakure, Kusagakure or Amegakure is fst more likely.

I'm not a wiki lurker, and I don't know the content of every episode by heart. I have no clue where to find that info. I'm just incredibly sure that that's how it is. My opinion is basically invalid, but shared by >95% of the fandom, so I'll assume it's correct.

if we go by what we know what "happened" to uzumaki then suna, iwa, and kumo would have to march in small villages first but they will eventually have to cross the border of land of fire. now such a large army moving is enough to alarm konoha, having an army of your enemy that you have fought in the last wars move about inside or outside your boarder is enough for a country to send thier troops to deny the enemy force to stop them from doing who knows what in your garden. but we know konoha did nothing here. these happened right after a war ended or is already begining so the villages attacking uzu does not make sense at all, they were wiped out in a single night. non of the villages captured a uzumaki and have no uzumaki jijurikis running about, they have no sealing jutsu from uzushio. unless we take into account omnipotence from boruto, kawaki having no uzumaki or hyuga traits, no whiskers for a supposed child of a jinjuriki become the true son of naruto with boruto who have basically same appearance as himawari and same hair color as naruto and have the makings of an uzumaki is still viewed as the adopted son of naruto. even reason can't shake the hold of omnipotence as only those unaffected by omnipotence is safe from it but those affected by it can't escape it. we all know that kaguya can be sealed and therefore anything can be sealed with proper sealing jutsu. maybe omnipotence is used in naruto before aida used it in boruto. the uzumaki clan sealed a literal death god to be used in reaper death seal (probably), so if they could do that or even make reaper death seal what can't they make against otsutsuki's and so the otsutsuki wiped uzumaki clan before that happened. after all it does not make sense that those villages who feared the power of a uzumaki jinjurikis will not take a uzumaki to be thier village's jinjuriki. those villages gained nothing from supposed to be raiding and destroying uzushiogakure.